pub fn missing_binary_for(launcher: &ResolvedLauncher) -> Option<String>Expand description
Probe whether the resolved launcher’s binary exists on $PATH. Used
by gwm doctor to emit a warning (exit code 1)
when the configured review/git_tui binary is missing — the launcher
itself is opt-in, so this is advisory, not a hard failure.
Returns the binary name on miss so the doctor check can include it
in the message verbatim (“not on PATH: lumen”). Returns None if
the binary resolves or if the launcher has no parseable argv.